Keypad Switching & Scanning - LG KF350 Service Manual

3. TECHNICAL BRIEF
3.7 Keypad Switching & Scanning
The keypad interface is a peripheral which can be used for scanning keypads up to 8 rows (outputs
from Port Control Logic) and 8 columns (inputs to PCL). The number of rows and columns depend on
settings of the PCL.
END
ON/END
END_KEY
KEYPAD
KEY_ROW0
KEY_ROW1
KEY_ROW2
KEY_ROW3
KEY_ROW4
KEY_ROW5
KEY_COL0
KEY_COL1
KEY_COL2
KEY_COL3
KEY_COL5
LGE Internal Use Only
VBAT
END_KEY
CLR
CLR FAV
1
SW100 SW101
SW103 SW104
4
SW106 SW107
7
* SW109
*
VOL_UP VOL_UP VOL_DOWN
SIDE KEY_VOL
Figure 10 Key pad part key matrix
- 42 -
R215
10K
(1%)
VA201
ICVN0505X150FR
FAV
CAMERA
CAMERA
2 3
LEFT
SW102 LEFT
SW105 UP
5 6
UP
SW108 RIGHT
8 9
RIGHT
SHARP DOWN
0 #
DOWN
VOL_DOWN
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
END_KEY_IN
KEY_ROW0
3
Q202
2
KTC4075E
1
KEY_COL2
MENU MENU
SEL
SEL
SEND
SEND
CONF
CONF